Flute Hss

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what's the best way to tap low grade aluminium ?

this may be in the wrong catagory but it's the closet thing i could find.

i need to tap a series of 1/2" BSP threads in some aluminium bar but cannot do it on the CNC machine as the tap picks up the swarf and starts to make a mess of the threads.
better grade material is out of the question because of the cost.
what's the best solution.

currently using a straight 4 flute HSS tap

have you tried spiral flute taps? the chips will be removed directly from the hole without stopping.

Discover Flute Hss On eBay Below:

5 8 82degree 6 FLUTE HIGH SPEED STEEL CHATTERLESS COUNTERSINK
5 8 82degree 6 FLUTE HIGH SPEED STEEL CHATTERLESS COUNTERSINK
$13.70
1 1 2 90degree 6 FLUTE HIGH SPEED STEEL CHATTERLESS COUNTERSINK
1 1 2 90degree 6 FLUTE HIGH SPEED STEEL CHATTERLESS COUNTERSINK
$63.50
0 HSS Helical Flute Taper Pin Reamer
0 HSS Helical Flute Taper Pin Reamer
$20.16
7 0 HSS Helical Flute Taper Pin Reamer
7 0 HSS Helical Flute Taper Pin Reamer
$22.50
4 0 HSS Helical Flute Taper Pin Reamer
4 0 HSS Helical Flute Taper Pin Reamer
$21.86
2 0 HSS Helical Flute Taper Pin Reamer
2 0 HSS Helical Flute Taper Pin Reamer
$19.56
5 0 HSS Helical Flute Taper Pin Reamer
5 0 HSS Helical Flute Taper Pin Reamer
$21.86
11 HSS Helical Flute Taper Pin Reamer
11 HSS Helical Flute Taper Pin Reamer
$117.53
3 0 HSS Helical Flute Taper Pin Reamer
3 0 HSS Helical Flute Taper Pin Reamer
$20.16
4 HSS Helical Flute Taper Pin Reamer
4 HSS Helical Flute Taper Pin Reamer
$28.13
OSG 9 16 24NEF HSS GH3 Japan 4 Flute Tap
OSG 9 16 24NEF HSS GH3 Japan 4 Flute Tap
$19.99
10 32 GH3 4 FLUTE HIGH SPEED STEEL 3 PIECE TAP SET MADE IN USA
10 32 GH3 4 FLUTE HIGH SPEED STEEL 3 PIECE TAP SET MADE IN USA
$17.99
3 pcs HELICOIL M12 x 175 STI H4 4 FLUTE TAP GH4 HSS MADE IN USA MACHINE SHOP
3 pcs HELICOIL M12 x 175 STI H4 4 FLUTE TAP GH4 HSS MADE IN USA MACHINE SHOP
$24.99
Chucking ReamerG6 FluteHSS ZORO SELECT 11V447
Chucking ReamerG6 FluteHSS ZORO SELECT 11V447
$12.98
0 0 HSS Spiral Flute Taper Pin Reamer
0 0 HSS Spiral Flute Taper Pin Reamer
$20.68
1 HSS Spiral Flute Taper Pin Reamer
1 HSS Spiral Flute Taper Pin Reamer
$20.89
2 HSS Spiral Flute Taper Pin Reamer
2 HSS Spiral Flute Taper Pin Reamer
$21.10
2 0 HSS Spiral Flute Taper Pin Reamer
2 0 HSS Spiral Flute Taper Pin Reamer
$21.30
3 HSS Spiral Flute Taper Pin Reamer
3 HSS Spiral Flute Taper Pin Reamer
$21.10
41 64 HSS Straight Flute Hand Reamer
41 64 HSS Straight Flute Hand Reamer
$46.17
1 1 2 HSS Straight Flute Hand Reamer
1 1 2 HSS Straight Flute Hand Reamer
$122.79
7 8 HSS Straight Flute Hand Reamer
7 8 HSS Straight Flute Hand Reamer
$47.25
3 16 HSS Straight Flute Hand Reamer
3 16 HSS Straight Flute Hand Reamer
$21.90
13 16 HSS Straight Flute Hand Reamer
13 16 HSS Straight Flute Hand Reamer
$46.68
3 4 HSS Straight Flute Hand Reamer
3 4 HSS Straight Flute Hand Reamer
$44.37
1 2 UNC 13 GH3 HSS 3 FLUTE SPIRAL POINT PLUG TAP
1 2 UNC 13 GH3 HSS 3 FLUTE SPIRAL POINT PLUG TAP
$12.99
5 32 HSS Straight Flute Hand Reamer
5 32 HSS Straight Flute Hand Reamer
$22.23
5 8 HSS Straight Flute Hand Reamer
5 8 HSS Straight Flute Hand Reamer
$38.43
1 8 HSS Straight Flute Hand Reamer
1 8 HSS Straight Flute Hand Reamer
$20.89
11 16 HSS Straight Flute Hand Reamer
11 16 HSS Straight Flute Hand Reamer
$41.25
2 Pcs 4mm Cutting Dia 3 Flutes HSS Machine Screw Thread Taper Taps
2 Pcs 4mm Cutting Dia 3 Flutes HSS Machine Screw Thread Taper Taps
$1.93
Cleveland 2565 High Speed Steel Long Length Drill Bit Parabolic Flute Uncoated
Cleveland 2565 High Speed Steel Long Length Drill Bit Parabolic Flute Uncoated
$104.39
14 504 011 4 Flute Left Hand High Speed Steel Tap Set Taperplug and bottoming H
14 504 011 4 Flute Left Hand High Speed Steel Tap Set Taperplug and bottoming H
$45.88
Helical Groove 4 Flutes 10mm Cutting Dia High Speed Steel End Mill Cutter
Helical Groove 4 Flutes 10mm Cutting Dia High Speed Steel End Mill Cutter
$16.86
5 44 GH2 HIGH SPEED STEEL 2 FLUTE TiN COATED SPIRAL POINT PLUG TAP
5 44 GH2 HIGH SPEED STEEL 2 FLUTE TiN COATED SPIRAL POINT PLUG TAP
$9.85
7 0 HSS Straight Flute Taper Pin Reamer
7 0 HSS Straight Flute Taper Pin Reamer
$23.77
2 HSS Straight Flute Taper Pin Reamer
2 HSS Straight Flute Taper Pin Reamer
$19.25
2 0 HSS Straight Flute Taper Pin Reamer
2 0 HSS Straight Flute Taper Pin Reamer
$20.27
6 HSS Straight Flute Taper Pin Reamer
6 HSS Straight Flute Taper Pin Reamer
$25.73

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